It's wiring and electrical systems time!
While tracing the start circuit, I noticed an intermittent signal and found the switch contacts were carboned up from arcing. I made a thread showing the contacts
condition and the need to add a relay to this circuit to protect the ignition switch. I repaired the switch and added the relay.
The battery is now in the truck so it opened up the battery box area to add two fuse boxes to handle any new additions. One fuse box has 12 volts all the time and the other is switched. The "hot" one also has a ground section so all the grounds for the added circuits now have a common ground location.
The start, ignition, and fuel pump circuits are done along with a ground wire going from the block and alternator to the old battery box area. The wiring will be enclosed once the fan wiring is done
This car was once fuel injected so there are several wires that need to be traced to see if they can be removed. It does not appear to have had the Rallye Gauge pack in it.
Next up is the charging circuit for the one-wire alternator and then the dash wiring (which should be interesting).